--- src/Makevars	2022-05-23 15:03:54.000000000 +0800
+++ src/Makevars	2024-12-18 21:40:12.000000000 +0800
@@ -1,5 +1,5 @@
-GSL_CFLAGS = -I/usr/local/include
-GSL_LIBS = -L/usr/local/lib -lgsl -lgslcblas -lm
+GSL_CFLAGS = -I@PREFIX@/include
+GSL_LIBS = -L@PREFIX@/lib -lgsl -lgslcblas -lm
 
 # combine with standard arguments for R
 PKG_CPPFLAGS = $(GSL_CFLAGS)